<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>事件监听的基本使用</title>
</head>
<body>
<div id="app">
  <h2>{{counter}}</h2>
  <!--第一种方式-->
  <!--<button v-on:click="counter++">+</button>
  <button v-on:click="counter--">-</button>-->
  <!--第二种方式-->
  <!--<button v-on:click="increment">+</button>
  <button v-on:click="decrement">-</button>-->
  <!--第三种方式：语法糖写法-->
  <button @click="increment">+</button>
  <button @click="decrement">-</button>
</div>
<script src="../js/vue.js"></script>
<script>
  const app = new Vue({
    el: '#app',
    data: {
      counter: 0
    },
    methods: {
      increment() {
        this.counter++
      },
      decrement() {
        this.counter--
      }
    }
  });
</script>
</body>
</html>
